1011221012 has 6 divisors (see below), whose sum is σ = 1769636778.
Its totient is φ = 505610504.
The previous prime is 1011221011. The next prime is 1011221033. The reversal of 1011221012 is 2101221101.
It can be written as a sum of positive squares in only one way, i.e., 983700496 + 27520516 = 31364^2 + 5246^2
It is a super-2 number, since 2×10112210122 = 2045135870220608288, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 1011220984 and 1011221002.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1011221011) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126402623 + ... + 126402630.
It is an arithmetic number, because the mean of its divisors is an integer number (294939463).
Almost surely, 21011221012 is an apocalyptic number.
It is an amenable number.
1011221012 is a deficient number, since it is larger than the sum of its proper divisors (758415766).
1011221012 is a wasteful number, since it uses less digits than its factorization.
1011221012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 252805257 (or 252805255 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 11.
The square root of 1011221012 is about 31799.7014451394.
The cubic root of 1011221012 is about 1003.7264337758.
Adding to 1011221012 its reverse (2101221101), we get a palindrome (3112442113).
The spelling of 1011221012 in words is "one billion, eleven million, two hundred twenty-one thousand, twelve".